I used these with a group of kids aged 1 to 8 years old. All ages of kids could do the project. I think the 3 to 8 year age range enjoyed these the most. I let them pick a couple of shapes each and gave them a white piece of paper and some markers so they could draw a background and then glue their scractch art onto the background.

Don't forget you will need to buy sticks separately for this project. The ones sold by Blick are nice.